LT1381IS 데이터 시트보기 (PDF) - Linear Technology

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LT1381IS

Low Power 5V RS232 Dual Driver/Receiver with 0.1µF Capacitors

Linear Technology 

LT1381

ELECTRICAL CHARACTERISTICS (Note 2)

PARAMETER

Receiver

Input Voltage Thresholds

Hysteresis

Input Resistance

Output Voltage

Output Short-Circuit Current

Propagation Delay

CONDITIONS

Input Low Threshold (VOUT = High)

Input High Threshold (VOUT = Low)

(Note 6)

Output Low, IOUT = – 1.6mA

Output High, IOUT = 160µA (VCC = 5V)

Sinking Current, VOUT = VCC

Sourcing Current, VOUT = 0V

Output Transition tHL High-to-Low (Note 5)

Output Transition tLH Low-to-High

MIN TYP MAX

0.8

1.3

1.7

2.4

q 0.1

0.4

1.0

3

5

7

q

0.2

0.4

q 3.5

4.2

– 20

– 10

10

20

250 600

350 600

UNITS

V

V

V

kΩ

V

V

mA

mA

ns

ns

The q denotes specifications which apply over the full operating

temperature range.

Note 1: Absolute Maximum Ratings are those values beyond which the life

of the device may be impaired.

Note 2: Testing done at VCC = 5V, unless otherwise specified.

Note 3: Supply current is measured as the average over several charge

pump cycles. C + = C – = C1 = C2 = 0.1µF. All outputs are open, with all

driver inputs tied high.

Note 4: For driver delay measurements, RL = 3k and CL = 51pF. Trigger

points are set between the driver’s input logic threshold and the output

transition to the zero crossing (tHL = 1.4V to 0V and tLH = 1.4V to 0V).

Note 5: For receiver delay measurements, CL = 51pF. Trigger points are

set between the receiver’s input logic threshold and the output transition

to standard TTL/CMOS logic threshold (tHL = 1.3V to 2.4V and tLH = 1.7V

to 0.8V).

Note 6: Tested at VIN = ±10V.

WU

TYPICAL PERFOR A CE CHARACTERISTICS

Driver Maximum Output Voltage

vs Load Capacitance

9.0

2 DRIVERS LOADED

8.5

8.0

7.5

20k BAUD

7.0

6.5

60k BAUD

6.0

5.5

120k BAUD

5.0

0 1 2 3 4 5 6 7 8 9 10

LOAD CAPACITANCE (nF)

LT1381 • TPC01

Driver Minimum Output Voltage

vs Load Capacitance

– 4.0

2 DRIVERS LOADED 120k BAUD

– 4.5

– 5.0

60k BAUD

– 5.5

– 6.0

20k BAUD

– 6.5

– 7.0

0 1 2 3 4 5 6 7 8 9 10

LOAD CAPACITANCE (nF)

LT1381 • TPC02

Driver Output Voltage

10

RL = 3k

8

6

VCC = 5.5V

4

VCC = 5V

VCC = 4.5V

2

OUTPUT HIGH

0

OUTPUT LOW

–2

VCC = 4.5V

–4

VCC = 5V

VCC = 5.5V

–6

–8

– 10

–55 –25

0 25 50 75 100 125

TEMPERATURE (°C)

LT1381 • TPC03

3

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